Skin cancers develop when the body is exposed to too much ultraviolet radiation (UV rays). Some of the DNA in the skin cells that are exposed to UV rays begin to mutate. They become known as oncogenes that instruct the cell to grow haphazardly.
If these cells are not destroyed by the immune system they will develop into cancerous growths. You can be exposed to UV rays in many ways but the most common way is by exposure to the Sun.
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